20108745 has 48 divisors (see below), whose sum is σ = 38001600. Its totient is φ = 9797760.

The previous prime is 20108731. The next prime is 20108747. The reversal of 20108745 is 54780102.

It is not a de Polignac number, because 20108745 - 2⁴ = 20108729 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24390 + ... + 25200.

It is an arithmetic number, because the mean of its divisors is an integer number (791700).

Almost surely, 2^20108745 is an apocalyptic number.

It is an amenable number.

20108745 is a deficient number, since it is larger than the sum of its proper divisors (17892855).

20108745 is a wasteful number, since it uses less digits than its factorization.

20108745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20108745 is about 4484.2775337840. The cubic root of 20108745 is about 271.9328382694.

Adding to 20108745 its reverse (54780102), we get a palindrome (74888847).

The spelling of 20108745 in words is "twenty million, one hundred eight thousand, seven hundred forty-five".